// divisors.c -- nests ifs display divisors of a number
#include <stdio.h>
#include <stdbool.h>
int main(void)
{
	unsigned long num;				// number to be checked
	unsigned long div;				// potential divisors
	bool isPrime;					// prime flag

	printf("Please enter an integer for analysis;");
	printf("Enter q to quit.\n");
	while (scanf("%lu", &num) == 1)
	{
		for (div = 2, isPrime = true; (div * div) <= num; div++)
		{
			if (num % div == 0)
			{
				if ((div * div != num))
					printf("%lu is divisible by %lu and %lu.\n",
						num, div, num / div);
				else
					printf("%lu is divisible by %lu.\n",
						num, div);
				isPrime = false;	// number is not prime
			}
		}
		if (isPrime)
			printf("%lu is prime.\n", num);
		printf("Please enter another integer for analysis; ");
		printf("Enter q to quit.\n");
	}
	printf("Bye.\n");

	return 0;
}